Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales	$ 675,851	$ 619,105	$ 500,168	$ 602,919	$ 543,839	$ 608,602	$ 666,394	$ 611,781	$ 2,398,043	$ 2,430,616	$ 2,507,878
Cost of goods sold									1,966,161	2,035,610	2,150,400
Depreciation and amortization									44,843	42,693	39,555
Selling, general, and administrative expense									159,483	162,358	148,888
Gain on sale of assets, net									0	(963)	(253)
Litigation settlement, net									(22,053)	0	0
Insurance recovery									0	(485)	(3,681)
Impairment charges									3,771	0	0
Operating income									245,838	191,403	172,969
Interest expense									(19,247)	(25,683)	(25,199)
Pension plan termination expense									(17,835)	0	0
Environmental expense									(4,454)	(1,321)	(1,320)
Other income, net									4,887	1,684	3,967
Income before income taxes									209,189	166,083	150,417
Expenditures for long-lived assets									51,146	31,162	124,936
Segment assets	1,528,568				1,370,940				1,528,568	1,370,940	1,369,549
Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									2,425,292	2,453,044	2,525,763
Intersegment Eliminations [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									(27,249)	(22,428)	(17,885)
Corporate Segment [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									(27,249)	(22,428)	(17,885)
Cost of goods sold									(19,810)	(25,230)	(18,152)
Depreciation and amortization									3,995	3,285	3,114
Selling, general, and administrative expense									41,367	44,444	43,597
Gain on sale of assets, net										0	3,141
Litigation settlement, net									(22,053)
Insurance recovery										0	0
Impairment charges									0
Operating income									(30,748)	(44,927)	(49,585)
Expenditures for long-lived assets									448	2,711	37
Segment assets	139,280				162,921				139,280	162,921	130,670
Piping Systems [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Impairment charges									3,800
Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,583,002	1,542,456	1,645,633
Cost of goods sold									1,311,697	1,313,980	1,426,729
Depreciation and amortization									23,071	22,621	23,304
Selling, general, and administrative expense									78,744	75,170	74,864
Gain on sale of assets, net										(1,194)	(2,093)
Litigation settlement, net									0
Insurance recovery										0	0
Impairment charges									3,771
Operating income									165,719	131,879	122,829
Expenditures for long-lived assets									39,209	15,505	31,362
Segment assets	977,937				796,262				977,937	796,262	818,303
Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									472,159	554,372	651,061
Cost of goods sold									398,000	473,010	559,367
Depreciation and amortization									7,528	7,489	7,568
Selling, general, and administrative expense									12,566	12,359	13,501
Gain on sale of assets, net										275	(1,301)
Litigation settlement, net									0
Insurance recovery										(485)	(3,681)
Impairment charges									0
Operating income									54,065	61,724	75,607
Expenditures for long-lived assets									5,968	9,101	8,066
Segment assets	152,683				161,904				152,683	161,904	173,725
Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									370,131	356,216	229,069
Cost of goods sold									276,274	273,850	182,456
Depreciation and amortization									10,249	9,298	5,569
Selling, general, and administrative expense									26,806	30,385	16,926
Gain on sale of assets, net										(44)	0
Litigation settlement, net									0
Insurance recovery										0	0
Impairment charges									0
Operating income									56,802	42,727	24,118
Expenditures for long-lived assets									5,521	3,845	85,471
Segment assets	$ 258,668				$ 249,853				258,668	249,853	246,851
Tube and fittings [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,232,724	1,271,558	1,352,875
Tube and fittings [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									1,232,724	1,271,558	1,352,875
Tube and fittings [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Tube and fittings [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Brass rod and forgings [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									356,547	425,573	501,472
Brass rod and forgings [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Brass rod and forgings [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									356,547	425,573	501,472
Brass rod and forgings [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
OEM components, tube and assemblies [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									236,854	210,858	222,272
OEM components, tube and assemblies [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									56,176	29,103	29,578
OEM components, tube and assemblies [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									42,127	48,104	53,581
OEM components, tube and assemblies [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									138,551	133,651	139,113
Valves and plumbing specialties [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									294,102	241,795	263,180
Valves and plumbing specialties [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									294,102	241,795	263,180
Valves and plumbing specialties [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Valves and plumbing specialties [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Other products [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									305,065	303,260	185,964
Other products [Member] | Piping Systems [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									0	0	0
Other products [Member] | Industrial Metals [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									73,485	80,695	96,008
Other products [Member] | Climate [Member] | Operating Segments [Member]
Segment Reporting Information, Income (Loss) before Income Taxes [Abstract]
Net sales									$ 231,580	$ 222,565	$ 89,956